Electrical-conduit terminal.



PATENTED DEG. 25, 190e.

C. J, DORP?. ELECTRICAL CONDUIT TERMINAL.

APPLICATION FILED DEO.21,1905.

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UNITED STAIRS PATENT OFFICE.

CONRAD J. DORFF, OF CHICAGO, ILLINOIS, ASSIGNOR 'IO FREDRIC CREER, OF CHICAGO, ILLINOIS.

ELECTRICAL-CONDUIT TERMINAL.

Specification of Letters Patent.

Patented Dec. 25, 1906.

Application filed December 21, 1905. Serial No. 292,812.

T0 a/ZZ whom, t may concern:

Be it known that I, CONRAD J. DORFF, a citizen of the United States of America, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Electrical- Conduit Terminals, of which the following is a specification.

This invention relates to that type of terminal bushings for electrical conduits in which the attaching-nut of the conduit is formed with a rounded non-abrasive throat or mouth whose internal diameter is less than the internal diameter of the conduit to afford a smooth exi-t for the electrical conductors and the present improvement has for its object to provide a simple and eflicient structural formation and combination of parts whereby an attaching-nut and bushing can be economically produced and which will afford a strong, durable, and eflicient article in practical use, all as will hereinafter more fully appear.

In the accompanying drawings, Figure 1 is a transverse section on line x, Fig. 2, of a terminal nut and bushing embodying the present invention. Fig. 2 is a front elevation of the same.

Similar numerals of reference indicate like parts in both views.

Referring to the drawings, 1 is the main body of the nut of an octagon or other usual form and having a central screw-threaded orifice or bore to receive a correspondingly screw-threaded end of an electrical conduit, as usual.

2 is an annular groove or channel formed in the interior surface of the orifice of the nut-body near the forward end of the same, as shown in Fig. l, and extending to or beyond the base of the screw-threads formed in said orice.

3 is an annular bushing of ductile sheet metal adapted for application, as hereinafter described, to the forward end of the aforesaid nut-body l. Such bushing will have an internal diameter which is .less than the internal diameter of the conduit or pipe on which the present device is used, so as to present a smooth exit for the conductors, as usual in the present class of bushings.

In its initial condition prior to application such bushing will have a shape in cross-section approximating the letter d, and in applying the same in place by means of suitably-formed pressure-heads having movement toward each other one circular edge will be expanded outwardly into the aforesaid annular groove of the nut-body l to effect a permanent and substantial attachment of the bushing in place. At the same time the other circular edge of said bushing is rolled back against the forward face of the nut-body l, so that with the bushing in place the same will have a substantially ciruclar form in cross-section, as illustrated in Fig. I.

Having thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A terminal for interior conduits, comprising a nut-body having a central bore formed with screw-threads and with an annular' groove, and an annular bushing of ductile sheet metal, one circular edge of which is expanded into said annular groove and the other edge rolled back against the front of the nut-body to effect a permanent attachment of bushing and afford a smooth exit for -the conductors.

December, 1905.

CONRAD J. DORFF. Witnesses:

ROBERT BURNS, M. H. HOLMES. 

